package com.sgcc.epri.dcloud.util.excel;



import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.RegionUtil;
import org.apache.poi.xssf.usermodel.*;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTColor;

import java.io.*;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * excel处理工具
 * 概念-> 表头数据:报表的表头
 *        行内数据:表头以下的数据
 * 功能:动态生成单级，多级Excel表头
 * 备注：tree型结构数据的root节点的id必须为零（0）
 * Created by wtj on 2018/3/2.
 *  修改:
 *     2019/03/18 修复生成跨列的bug
 *     2019/03/20 修复集合存在root的时候，生成不了动态表头
 * @param <T>
 */
public class ExcelTool<T> {

    private XSSFWorkbook workbook;//excel 对象
    private String title; //表格标题
    private int colWidth = 20; //单元格宽度
    private int rowHeight = 20;//单元格行高度
    private XSSFCellStyle styleHead; //表头样式
    private XSSFCellStyle styleBody; //主体样式
    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //日期格式化,默认yyyy-MM-dd HH:mm:ss

    /**
     * 无参数 初始化 对象
     */
    public ExcelTool(){
        this.title="sheet1";
        this.workbook = new XSSFWorkbook();
        init(0);
    }

    /**
     * 有参数 初始化 对象
     * @param title
     * @param colWidth
     * @param rowHeight
     * @param dateFormat
     */
    public ExcelTool(String title, int colWidth, int rowHeight, String dateFormat){
        this.colWidth = colWidth;
        this.rowHeight = rowHeight;
        this.title = title;
        this.workbook = new XSSFWorkbook();
        this.sdf = new SimpleDateFormat(dateFormat);
        init(0);
    }

    public ExcelTool(String title, int colWidth, int rowHeight){
        this.colWidth = colWidth;
        this.rowHeight = rowHeight;
        this.title = title;
        this.workbook = new XSSFWorkbook();
        init(0);
    }
    public ExcelTool(String title, int colWidth, int rowHeight, int flag){
        this.colWidth = colWidth;
        this.rowHeight = rowHeight;
        this.title = title;
        this.workbook = new XSSFWorkbook();
        init(flag);
    }
    public ExcelTool(String title){
        this.title = title;
        this.workbook = new XSSFWorkbook();
        init(0);
    }
    /**ExcelTool 属性 get、set 方法 开始*/
    public int getColWidth() {
        return colWidth;
    }

    public void setColWidth(int colWidth) {
        this.colWidth = colWidth;
    }

    public int getRowHeight() {
        return rowHeight;
    }

    public void setRowHeight(int rowHeight) {
        this.rowHeight = rowHeight;
    }

    public XSSFWorkbook getWorkbook() {
        return this.workbook;
    }

    public void setWorkbook(XSSFWorkbook workbook) {
        this.workbook = workbook;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }


    public XSSFCellStyle getStyleHead() {
        return styleHead;
    }


    public void setStyleHead(XSSFCellStyle styleHead) {
        this.styleHead = styleHead;
    }


    public XSSFCellStyle getStyleBody() {
        return styleBody;
    }


    public void setStyleBody(XSSFCellStyle styleBody) {
        this.styleBody = styleBody;
    }
    /**ExcelTool 属性 get、set 方法 结束*/
    //内部统一调用的样式初始化
    private void init(int styleFlag){
        this.styleHead = this.workbook.createCellStyle();
        this.styleBody = this.workbook.createCellStyle();
        this.styleHead.setAlignment(HorizontalAlignment.CENTER);// 左右居中
        this.styleHead.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中
        this.styleBody.setBorderBottom(BorderStyle.THIN);
        this.styleBody.setBorderLeft(BorderStyle.THIN);
        this.styleBody.setBorderRight(BorderStyle.THIN);
        this.styleBody.setBorderTop(BorderStyle.THIN);
        switch(styleFlag){
            case 1:
                this.styleBody = this.workbook.createCellStyle();
                this.styleBody.setAlignment(HorizontalAlignment.CENTER);// 左右居中ALIGN_CENTER
                this.styleBody.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中
                this.styleBody.setBorderRight(BorderStyle.THIN);// 边框的大小
                this.styleBody.setBorderBottom(BorderStyle.THIN);// 边框的大小
                break;
            default:
                this.styleBody = this.workbook.createCellStyle();
                this.styleBody.setAlignment(HorizontalAlignment.CENTER);// 左右居中ALIGN_CENTER
                this.styleBody.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中
                this.styleBody.setBorderRight(BorderStyle.THIN);// 边框的大小
                this.styleBody.setBorderBottom(BorderStyle.THIN);// 边框的大小
                break;
        }
    }
    /**
     * 导出表格 无返回
     * @param listTpamscolumn 表头数据
     * @param datas 行内数据
     * @param FilePath 保存路径
     * @param flag
     * @param rowFlag
     * @throws Exception
     */
    public void exportExcel(List<Column> listTpamscolumn, List<T> datas, String FilePath, boolean flag, boolean rowFlag) throws Exception{
        splitDataToSheets(datas, listTpamscolumn,flag,rowFlag);
        save(this.workbook,FilePath);
    }

    /**
     * 返回workbook
     * @param listTpamscolumn 表头数据
     * @param datas 行内数据
     * @param flag 是否写入行内数据
     * @return
     * @throws Exception
     */
    public XSSFWorkbook exportWorkbook(List<Column> listTpamscolumn, List<T> datas , boolean flag) throws Exception{
        splitDataToSheets(datas, listTpamscolumn,flag,false);
        return this.workbook;
    }
    /**
     * 导出表格 有返回值
     * @param listTpamscolumn 表头数据
     * @param datas 行内数据
     * @param flag  只输出表头数据
     * @param rowFlag
     * @return
     * @throws Exception
     */
    public InputStream exportExcel(List<Column> listTpamscolumn, List<T> datas, boolean flag, boolean rowFlag) throws Exception {
        splitDataToSheets(datas, listTpamscolumn,flag,rowFlag);
        return save(this.workbook);
    }
    /**
     * 导出Excel,适用于web导出excel
     * @param sheet excel
     * @param data 行内数据
     * @param listTpamscolumn 表头数据
     * @param flag 只输出表头数据
     * @param rowFlag 输出展示数据的结构(表头下面行的数据)
     * @throws Exception
     */
    private void writeSheet(XSSFSheet sheet, List<T> data, List<Column> listTpamscolumn, boolean flag, boolean rowFlag) throws Exception {
        sheet.setDefaultColumnWidth(colWidth);
        sheet.setDefaultRowHeightInPoints(rowHeight);
        sheet = createHead(sheet, listTpamscolumn.get(0).getTotalRow(), listTpamscolumn.get(0).getTotalCol());
        createHead(listTpamscolumn,sheet,0);
        if(flag)//控制是否 bug修复：每次写入行数据时，总是漏第一个条数据 rowIndex 错误
            writeSheetContent(listTpamscolumn,data,sheet, listTpamscolumn.get(0).getTotalRow()+1,rowFlag);
    }
    /**
     *  拆分sheet，因为每个sheet不能超过65535，否则会报异常
     * @param data 行内数据
     * @param listTpamscolumn 表头数据
     * @param flag 只输出表头数据
     * @param rowFlag  输出展示数据的结构(表头下面行的数据)
     * @throws Exception
     */
    private void splitDataToSheets(List<T> data, List<Column> listTpamscolumn, boolean flag, boolean rowFlag)throws Exception{
        int dataCount = data.size();
        int maxColumn = 65535;
        int pieces = dataCount/maxColumn;
        for(int i = 1; i <= pieces;i++){
            XSSFSheet sheet = this.workbook.createSheet(this.title+i);
            List<T> subList = data.subList((i-1)*maxColumn, i*maxColumn);
            writeSheet(sheet,subList, listTpamscolumn,flag,rowFlag);
        }
        XSSFSheet sheet = this.workbook.createSheet(this.title+(pieces+1));
        writeSheet(sheet, data.subList(pieces*maxColumn, dataCount), listTpamscolumn,flag,rowFlag);
    }

    /**
     * 把数据写入到单元格
     * @param listTpamscolumn 表头数据
     * @param datas 行内数据
     * @param sheet 工作表（excel分页）
     * @throws Exception
     * void
     */
    private void writeSheetContent(List<Column> listTpamscolumn, List<T> datas, XSSFSheet sheet, int rowIndex, boolean rowFlag) throws Exception{
        XSSFRow row = null;
        List<Column>  listCol=new ArrayList<>();
        rowFlag=false;
        if(rowFlag){//暂时没有用 后面扩展用
            for (int i = 0, index = rowIndex; i < datas.size(); i++, index++) {
                row = sheet.createRow(index);//创建行
                for (int j = 0; j < listTpamscolumn.size(); j++) {
                    createColl(row,j,listTpamscolumn.get(j).getFieldName() ,datas.get(i));
                }
            }
        }
        else {
            getColumnList(listTpamscolumn, listCol);
            for (int i = 0, index = rowIndex; i < datas.size(); i++, index++) {
                row = sheet.createRow(index);//创建行
                for (int j = 0; j < listCol.size(); j++) {
                    Column c = listCol.get(j);
                    createCol(row, c, datas.get(i));
                }

            }
        }
    }

    /**
     * 根据list 来创建单元格 暂时没有用
     * @param row
     * @param j
     * @param finame
     * @param t
     */
    private void createColl(XSSFRow row, int j, String finame, T t) {
        XSSFCell cell = row.createCell(j);  //创建单元格
        cell.setCellStyle(this.styleBody); //设置单元格样式
        String text="";
        if(t instanceof List){
            List<Map> temp= (List<Map>)t;
            if(j>=temp.size()) return;
            text=String.valueOf(  temp.get(j).get(finame)==null?"": temp.get(j).get(finame));
        }
        HSSFRichTextString richString = new HSSFRichTextString(text);
        cell.setCellValue(richString);
    }

    /**
     * 把column的columnList整理成一个list<column> 过滤表头的脏数据
     * @param list 表头数据
     * @param listCol 返回新的list
     * @return
     * List<column>
     */
    private void getColumnList(List<Column> list, List<Column> listCol){
        for(int i = 0; i < list.size(); i++){
            if(list.get(i).getFieldName() != null){
                listCol.add(list.get(i));
            }
            List<Column> listChilren = list.get(i).getListTpamscolumn();
            if(listChilren.size() > 0){
                getColumnList( listChilren, listCol);
            }
        }
    }

    /**
     * 保存Excel到InputStream，此方法适合web导出excel
     * @param workbook
     * @return
     */
    private InputStream save(XSSFWorkbook workbook) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            workbook.write(bos);
            InputStream bis = new ByteArrayInputStream(bos.toByteArray());
            return bis;
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * 保存excel到本机指定的路径
     * @param workbook
     * @param filePath
     * @throws IOException
     */
    private void save(XSSFWorkbook workbook, String filePath){
        File file = new File(filePath);
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        FileOutputStream fOut = null;
        try {
            fOut = new FileOutputStream(file);
            workbook.write(fOut);
            fOut.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {if(null!=fOut) fOut.close();} catch (Exception e1) { }
    }

    /**
     * 创建行
     * @param row Excel对应的行
     * @param tpamscolumn 当前单元格属性
     * @param v
     * @param j
     * @return
     * @throws Exception
     */
    public int createRowVal(XSSFRow row, Column tpamscolumn, T v, int j) throws Exception{
        //遍历标题
        if(tpamscolumn.getListTpamscolumn() != null && tpamscolumn.getListTpamscolumn().size() > 0){
            for(int i = 0; i < tpamscolumn.getListTpamscolumn().size(); i++){
                createRowVal(row, tpamscolumn.getListTpamscolumn().get(i),v,j);
            }
        }else{
            createCol(row, tpamscolumn,v);
        }
        return j;

    }

    /**
     * 创建单元格
     * @param row  Excel对应的行
     * @param tpamscolumn 当前单元格对象
     * @param v
     * @throws Exception
     */
    public void createCol(XSSFRow row, Column tpamscolumn, T v) throws Exception{
        XSSFCell cell = row.createCell( tpamscolumn.getCol());  //创建单元格
        cell.setCellStyle(this.styleBody); //设置单元格样式
        final Object[] value = {null};
        if(v instanceof Map){
            Map m=(Map)v;
            m.forEach((k, val) -> {
                if(k.equals(tpamscolumn.getFieldName()) && !tpamscolumn.isHasChilren()){
                    if(val instanceof Map){
                       Map map = (Map)val;
                        value[0] =map.get("value");
                    }else {
                        value[0] =val;
                    }
                }
            });
            if (value[0] == null) {
                value[0] = "/";
            }
        }else {
            Class<?> cls = v.getClass();// 拿到该类
            Field[] fields=cls.getDeclaredFields();// 获取实体类的所有属性，返回Field数组
            for(int i=0;i<fields.length;i++){
                Field f = fields[i];
                f.setAccessible(true); // 设置些属性是可以访问的
                if(tpamscolumn.getFieldName().equals(f.getName()) && !tpamscolumn.isHasChilren() )// && !tpamscolumn.isHasChilren()
                    value[0] =  f.get(v);
                if(value[0] instanceof Date)
                    value[0] = parseDate((Date) value[0]);
            }
        }
        if(value[0]!=null) {
            XSSFRichTextString richString = new XSSFRichTextString(value[0].toString());
            cell.setCellValue(richString);
        }

    }

    /**
     * 时间转换
     * @param date
     * @return
     * String
     */
    private String parseDate(Date date){
        String dateStr = "";
        try{
            dateStr = this.sdf.format(date);
        } catch (Exception e){
            e.printStackTrace();
        }
        return dateStr;
    }


    /**
     * 根据数据的行数和列数，在excel创建单元格cell
     * @param sheetCo excel分页
     * @param r excel 行数
     * @param c excel 列数
     * @return
     */
    public XSSFSheet createHead(XSSFSheet sheetCo, int r, int c){
        for(int i = 0; i <r; i++){
            XSSFRow row = sheetCo.createRow(i);
            for(int j = 0; j <c; j++){
                XSSFCell cell=row.createCell(j);
            }
        }
        return sheetCo;
    }
    /**
     * 使用递归 在excel写入表头数据 支持单级，多级表头的创建
     * @param listTpamscolumn 表头数据
     * @param sheetCo 哪个分页
     * @param rowIndex 当前Excel的第几行
     */
    public void createHead(List<Column> listTpamscolumn, XSSFSheet sheetCo, int rowIndex){
        XSSFRow row = sheetCo.getRow(rowIndex);
//        if(row == null)row = sheetCo.createRow(rowIndex);
        int len = listTpamscolumn.size();//当前行 有多少列
        for(int i = 0; i <len; i++){//i是headers的索引，n是Excel的索引 多级表头
            Column tpamscolumn = listTpamscolumn.get(i);
            //创建这一行的第几列单元格
            int r = tpamscolumn.getRow();
            int rLen = tpamscolumn.getrLen();
            int c = tpamscolumn.getCol();
            int cLen = tpamscolumn.getcLen();
            int endR = r+rLen;
            int endC = c+cLen;
            if(endC > c){
                endC--;
            }
            XSSFCell cell = row.getCell(c);
//            if( null == cell)cell = row.createCell(c);

            XSSFRichTextString text = new XSSFRichTextString(tpamscolumn.getContent());
            cell.setCellStyle(this.styleHead); //设置表头样式
            cell.setCellValue(text);
            // 合并单元格
            CellRangeAddress cra = new CellRangeAddress(r,endR,c,endC);
            String str = cra.toString();
            String[] split1 = str.split("\\[");
            String[] split2 = split1[1].replaceAll("\\]", "").split(":");
            if (!split2[0].equals(split2[1])) {
                sheetCo.addMergedRegion(cra);
            }

            // 使用RegionUtil类为合并后的单元格添加边框
            RegionUtil.setBorderBottom(BorderStyle.THIN, cra,sheetCo); // 下边框
            RegionUtil.setBorderLeft(BorderStyle.THIN, cra, sheetCo); // 左边框
            RegionUtil.setBorderRight(BorderStyle.THIN, cra, sheetCo); // 有边框

            if(tpamscolumn.isHasChilren()){
                rowIndex=r+1;
                createHead( tpamscolumn.getListTpamscolumn(), sheetCo,rowIndex);
            }
        }
    }


    /**
     * 转换成column对象
     *  支持List<T>的数据结构:map String ，只能是单级的数据
     * @param list 需要转换的数据
     * @return
     */
    public  List<Column> columnTransformer(List<T>  list){
        List<Column> lc=new ArrayList<>();
        if(list.get(0)instanceof Map) {
            final int[] i = {1};
            for (Map<String, String> m :(List<Map<String, String>>)list ) {
                m.forEach((k, val) -> {
                    Column tpamscolumn = new Column();
                    tpamscolumn.setId(String.valueOf(i[0]));
                    tpamscolumn.setPid("0");
                    tpamscolumn.setContent(k);
                    tpamscolumn.setFieldName(val);
                    lc.add(tpamscolumn);
                    i[0]++;
                });
            }
        } else {
            int i = 1;
            for(String s:(List<String>)list) {
                Column tpamscolumn = new Column();
                tpamscolumn.setId(String.valueOf(i));
                tpamscolumn.setPid("0");
                tpamscolumn.setContent(s);
                tpamscolumn.setFieldName(null);
                lc.add(tpamscolumn);
                i++;
            }
        }
        setParm(lc,"0");//处理一下
        List<Column> s = TreeTool.buildByRecursive(lc,"0");
        setColNum(lc,s,s);
        return s;
    }

    /**
     * 转换成column对象 返回tree数据结构
     * 支持：List<map>、某个具体对象（entity）数据的转换
     * @param list 需要转换的数据
     * @param id 当前节点id 字段的名称  主键
     * @param pid 父节点id 字段的名称
     * @param content 填写表头单元格内容的 字段名称
     * @param fielName 填写行内数据对的 字段名称
     * @param rootid  rootid的值
     * @return
     * @throws Exception
     */
    public List<Column> columnTransformer(List<T> list , String id, String pid, String content, String fielName,String rootid) throws Exception {
        List<Column> lc=new ArrayList<>();
        if(list.get(0) instanceof Map){
            for(Map m:(List<Map>)list) {
                Column tpamscolumn = new Column();
                m.forEach((k, val) -> {//java8 以上的遍历方式
                    if (id.equals(k))
                        tpamscolumn.setId(String.valueOf(val));
                    if (pid.equals(k)) tpamscolumn.setPid((String) val);
                    if (content.equals(k)) tpamscolumn.setContent((String) val);
                    if (fielName.equals(k) && fielName != null) tpamscolumn.setFieldName((String) val);
                });
                lc.add(tpamscolumn);
            }
        }else {
            for (T t : list) {//反射
                Column tpamscolumn = new Column();
                Class cls = t.getClass();
                Field[] fs=cls.getDeclaredFields();
                for (int i = 0; i < fs.length; i++) {
                    Field f = fs[i];
                    f.setAccessible(true); // 设置些属性是可以访问的
                    if (id.equals(f.getName()) && f.get(t) != null)
                        tpamscolumn.setId(f.get(t).toString());
                    if (pid.equals(f.getName()) && f.get(t) != null)
                        tpamscolumn.setPid(f.get(t).toString());
//                    if (pid.equals(f.getName()) && ( f.get(t) == null || "".equals(f.get(t)))) tpamscolumn.setPid("0");
                    if (content.equals(f.getName()) && f.get(t) != null)
                        tpamscolumn.setContent(f.get(t).toString());
                    if ( f.get(t) != null  && fielName!=null && fielName.equals(f.getName()))
                        tpamscolumn.setFieldName(f.get(t).toString());
                }
                lc.add(tpamscolumn);
            }
        }
        setParm(lc,rootid);//处理一下
        List<Column> s = TreeTool.buildByRecursive(lc,rootid);
        setColNum(lc,s,s);
        return s;
    }
    /**
     * 设置基础的参数
     * @param list
     */
    public static void setParm(List<Column> list,String rootid){
        int row = 0;//excel第几行
        int rLen = 0; //excel 跨多少行
        int totalRow = TreeTool.getMaxStep(list);
        int totalCol = TreeTool.getDownChilren(list,rootid);
        for(int i=0;i<list.size();i++){
            Column poit= list.get(i);
            int tree_step = TreeTool.getTreeStep(list,poit.getPid(),0);//往上遍历tree
            poit.setTree_step(tree_step);
            poit.setRow(tree_step);//设置第几行
            //判断是否有节点
            boolean hasCh = TreeTool.hasChild( list,poit);
            poit.setHasChilren(hasCh);
            if(hasCh){
                poit.setrLen(0);//设置跨多少行
            }else{
                if(tree_step < totalRow){
                    rLen = totalRow - tree_step;
                }
                poit.setrLen(rLen);
            }
//            boolean flag=false;//控制只有root 节点才有总的行数信息
//            if(rootid == null && rootid == poit.getId() )flag = true;
//            if(rootid != null && rootid.equals(poit.getId()))flag = true;
//            if(flag){
//
//            }
            poit.setTotalRow(totalRow);
            poit.setTotalCol(totalCol);
        }
    }

    /**
     * 设置基础的参数
     * @param list 所有list数据，一条一条
     * @param treeList 转成tree结构的list
     */
    public static void setColNum(List<Column> list, List<Column> treeList,List<Column> flist){
//        int col = pcIndex;//excel第几列
//        int cLen ;//xcel跨多少列
        List<Column> new_list = new ArrayList<>();//新的遍历list
        for(int i = 0;i < treeList.size();i++){
            Column poit= treeList.get(i);
//            String temp_id = TreeTool.getStepFid(list,poit.getId() ,1);
            int col = TreeTool.getFCol(list,poit.getPid()).getCol();
            int brotherCol = TreeTool.getBrotherChilNum(list,poit);
            poit.setCol(col+brotherCol);
            int cLen = TreeTool.getDownChilren(list,poit.getId());
            if(cLen<=1)cLen=0;
//            else  cLen--;
            poit.setcLen(cLen);//设置跨多少列
            if(poit.getListTpamscolumn().size()>0){
                new_list.addAll(poit.getListTpamscolumn());
            }
        }
        if(new_list.size() > 0){
            setColNum( list,new_list,flist);
        }
    }
//========上部分是导出excel的使用（生成excel），下部分是解析excel，由于excel导入==================================================================================================================================

    /**
     * 根据HSSFCell类型设置数据
     * @param cell 单元格
     * @return
     */
//    public static String getCellFormatValue(Cell cell) {
//        String cellvalue = "";
//        if (cell != null) {
//            switch (cell.getCellType()) { // 判断当前Cell的Type
//
//                case HSSFCell.CELL_TYPE_NUMERIC:  // 如果当前Cell的Type为NUMERIC
//                case HSSFCell.CELL_TYPE_FORMULA: {
//                    // 判断当前的cell是否为Date
//                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
//                        Date date = cell.getDateCellValue();
//                        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
//                        cellvalue = sdf.format(date);
//                    }
//                    else { // 如果是纯数字
//                        cellvalue = String.valueOf(cell.getNumericCellValue());
//                    }
//                    break;
//                }
//                case HSSFCell.CELL_TYPE_STRING:  // 如果当前Cell的Type为STRIN
//                    // 取得当前的Cell字符串
//                    cellvalue = cell.getRichStringCellValue().getString();
//                    break;
//                default:  // 默认的Cell值
//                    cellvalue = "";
//            }
//        } else {
//            cellvalue = "";
//        }
//        return cellvalue;
//    }

    /**
     * 描述：根据文件后缀，自适应上传文件的版本
     * @param inStr,fileName
     * @return
     * @throws Exception
     */
    public static Workbook getWorkbookType(InputStream inStr, String fileName) throws Exception{
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if(".xls".equals(fileType)){
            wb = new HSSFWorkbook(inStr);  //2003-
        }else if(".xlsx".equals(fileType)){
            wb = new XSSFWorkbook(inStr);  //2007+
        }else{
            throw new Exception("导入格式错误");
        }
        return wb;
    }

    /**
     * 获取单元格数据内容为字符串类型的数据
     * @param cell Excel单元格
     * @return String 单元格数据内容
     */
    public static String getStringCellValue(Cell cell) {
        String strCell = "";
        if (cell == null) {
            return "";
        }
//        switch (cell.getCellType()) {
//            case Cell.CELL_TYPE_STRING:
//                strCell = cell.getStringCellValue().trim();
//                break;
//            case Cell.CELL_TYPE_NUMERIC:
//                strCell = String.valueOf(cell.getNumericCellValue()).trim();
//                break;
//            case Cell.CELL_TYPE_BOOLEAN:
//                strCell = String.valueOf(cell.getBooleanCellValue()).trim();
//                break;
//            case Cell.CELL_TYPE_BLANK:
//                strCell = "";
//                break;
//            default:
//                strCell = "";
//                break;
//        }
        if (strCell.equals("") || strCell == null) {
            return "";
        }
        return strCell;
    }
    /**
     * 判断指定的单元格是否是合并单元格
     * @param sheet
     * @param row    行下标
     * @param column 列下标
     * @return
     */
    public  boolean isMergedRegion(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 获取合并单元格的值
     * @param sheet
     * @param row 行下标
     * @param column 列下标
     * @return
     */
    public  String getMergedRegionValue(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();

        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress ca = sheet.getMergedRegion(i);
            int firstColumn = ca.getFirstColumn();
            int lastColumn = ca.getLastColumn();
            int firstRow = ca.getFirstRow();
            int lastRow = ca.getLastRow();
            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    org.apache.poi.ss.usermodel.Row fRow = sheet.getRow(firstRow);
                    Cell fCell = fRow.getCell(firstColumn);
                    return getStringCellValue(fCell);
                }
            }
        }
        return "";
    }

    /**
     *  判断整行是否为空
     *  @param row  excel得行对象
     *  @param  maxRow 有效值得最大列数
     */

}